Additionally, I can check the AWS RDS console for information on my database instance. The console looks like this.

Right now I am assuming that
"username" in SQLAlchemy refers to the "Master Username" in the AWS RDS console,
"server" in SQLAlchemy refers to the "Endpoint" in the AWS RDS console,
and "db" refers to the "Database Instance Name"

What am I doing wrong??

If someone could describe the SQLALCHEMY_DATABASE_URI for me with the AWS RDS console terms, that would completely solve the problem.